State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing, People's Republic of China.
Nanotechnology. 2011 Sep 30;22(39):395703. doi: 10.1088/0957-4484/22/39/395703. Epub 2011 Sep 5.
The construction of nanocrystals with controllable composition and desirable micro-nanostructures is a well-known challenge. A combination of favorable composition and optimized micro-nanostructures can enhance the performance of a material significantly. Using TiO(2) as an example, we demonstrate here a facile approach to prepare anatase/rutile mixed-phase TiO(2) hollow micro-nanospheres with hierarchical mesopores. Our strategy relies on polymer-assisted assembly of ∼ 5 nm nano-building blocks into three-dimensional hierarchical hollow micro-nanospheres in a mixed alcohol-water solution. This superior micro-nanostructure endows the sample with hierarchical mesopores and a high surface area of 106 m(2) g(-1). We also show that, due to the synergetic effects of the mixed-phase composition and the micro-nanostructures, the sample exhibited significantly improved photovoltaic performance and similar photocatalytic performance compared with the commercial Degussa P25. These results suggested that our sample has great potential for future photovoltaic and photocatalytic applications.
具有可控组成和理想微纳结构的纳米晶体的构建是一个众所周知的挑战。有利的组成和优化的微纳结构的组合可以显著提高材料的性能。以 TiO(2) 为例，我们在这里展示了一种简便的方法来制备具有分级介孔的锐钛矿/金红石混合相 TiO(2) 空心微纳球。我们的策略依赖于在混合醇-水溶液中，通过聚合物辅助将约 5nm 的纳米构建块组装成三维分级空心微纳球。这种优越的微纳结构赋予了样品具有分级介孔和 106 m(2) g(-1) 的高表面积。我们还表明，由于混合相组成和微纳结构的协同作用，与商业 Degussa P25 相比，该样品表现出显著提高的光电性能和类似的光催化性能。这些结果表明，我们的样品在未来的光电和光催化应用中有很大的潜力。
